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Invasive Species: Zebra and Quagga Mussels - Presented by the University of Idaho Kootenai County Extension as part of its 2013 Horticulture Series. Kim Knerl, certified Master Gardener, will present this workshop on these invasive species, the effects on our waterways, and what is being done to slow the progression. Registration required at (208) 446-1680 or the Extension Office. Monday, 6-8 p.m., University of Idaho Kootenai County Extension Office, 1808 N. Third St., Coeur d’Alene. $10.

Town and Country Iris Society Meeting - The program will be presented by peony and lily grower Mike Mejie. A short business meeting will follow, including a discussion of the upcoming Iris Show scheduled for June 1 at the Spokane Valley Mall. For more information, call group president Robert Karr at (509) 671-1539 or email iris@sprucecorner.com. Friday, 7 p.m., Argonne Library, 4322 N. Argonne Road, Spokane Valley. Free. (509) 893-8260.

Organic Veggie Gardening 101 Workshop with Pat Munts - Find out how to grow a great garden without using chemicals. Munts will share tips and tricks to build your soil and keep bugs at bay so you can grow and harvest healthy food. Saturday, 11 a.m.-1 p.m., Sun People Dry Goods, 32 W. Second Ave. $15. Registration Required. (509) 368-9378.

Learn to Make Seed Pellets - Learn about “seed pelletizing,” an ancient method that was revived in the last half of the 20th century. Saturday, 1-4 p.m., Pine Meadow Farm Center, 10425 S. Andrus Road, Cheney. $15/adults; $5/children ages 15 and younger. No one turned away for lack of funds. (509) 448-3066.

Ikebana - Learn ikebana, the art of flower arranging. Mondays, 5-6 p.m., through May 13; no lesson April 1. Flowers cost $7-$10/per class. There is no lesson fee, but donations are appreciated. Japanese Cultural Center, 4000 W. Randolph Road. Class size is limited to 25 individuals; please make reservations at (509) 328-2971.

Vermicomposting Workshop - Learn the benefits of worm composting, proper care and how to avoid common problems, and how you can create your own worm bin with inexpensive materials. April 9, 3-5 p.m., Sun People Dry Goods, 32 W. Second Ave. $5. Registration required. (509) 368-9378.

Composting 101 Workshop - Marilyn and Chris Carothers will show you the best ways to compost outdoors. Please bring at least a gallon-size container of whatever material you would like to put in the compost as your entrance fee. April 13, 11 a.m.-1 p.m., Sun People Dry Goods, 32 W. Second Ave. Free. Registration required. (509) 368-9378.

Companion Planting - Plants have relationships with each other, often times beneficial ones. Learn some of the basics about companion planting. April 15, 3-5 p.m., Sun People Dry Goods, 32 W. Second Ave. $5. Registration required. (509) 368-9378.

Weed Education Day on Tap - University of Idaho Extension and the Bonner County Noxious Weed Department present a weed education day. The workshop will present such topics as the Bonner County Weed Cooperative Program, a weed control in forestry update, bio-control of weeds, resources, and new landscape herbicides. To register contact the extension office at (208) 263-8511. Registration is encouraged by April 13. April 19, 8:30 a.m.-noon, University of Idaho Extension Office in Bonner County, 4205 N. Boyer, Sandpoint. $5/registered; $10/day of class.

Spring History Walks - Each walk complements the current exhibit at Northwest Museum of Arts and Culture, “David Douglas: A Naturalist at Work.” The bus will meet at the MAC at 9 a.m. and return at 3 p.m. Pack a lunch for a picnic along the way. All tours include a visit to the Douglas exhibit at the end of the trip. The tours are: April 20, Swanson Lakes, Twin Lakes and Coffeepot Lake; May 4, Little Falls and the mouth of the Spokane River; May 18, Colville Valley and Little Pend Oreille Wildlife Refuge. Registration form: jacknisbet.com/events/? event_id=163. Northwest Museum of Arts and Culture, 2316 W. First Ave. $55/per person, per trip. (509) 466-2823.

Backyard Forests Workshop- Learn how to keep your trees healthy and attractive. Focus on landowners of five acres or less. Registration deadline is April 16. April 23, 1 p.m., Community Presbyterian Church, St. Maries, Idaho. $5/includes handouts and refreshments. (208) 446-1680.

Spring Compost Fair and Arbor Day Event - Learn how to reduce waste and improve your soil at this event sponsored by the Spokane Master Composters/Recyclers. Spokane County residents who complete the activities may take home a free compost bin (limit one per household). April 27, 11 a.m., Finch Arboretum, 3404 W. Woodland Blvd. Free. (509) 625-6800.

Growing Your Own Bee Garden - Learn what flowering plants and trees are the most nutritious for bees and how best to cultivate them in your garden. April 27, 3-4 p.m., Sun People Dry Goods, 32 W. Second Ave. $12. Registration required. (509) 368-9378.

Animals

Easter on Horseback - Riders gather at 10 a.m. at the Equestrian Center in Riverside State Park. The service will be at 11 a.m. at the picnic shelter at the Bowl and Pitcher. This will be a nondenominational worship service led by Joel Crosby, a former pastor, with guitar music by Nathan Smith. A potluck after the service will be at the Equestrian Center at 1 p.m. No stallions or dogs. A Discover Pass is required to park at the Equestrian Center. Today, Riverside State Park, 4427 N. Aubrey L. White Parkway. (509) 724-1668.